pinMode()

Description

Configures the specified pin to behave either as an input or an output. See the Digital Pins page for details on the functionality of the pins.

As of Arduino 1.0.1, it is possible to enable the internal pullup resistors with the mode INPUT_PULLUP. Additionally, the INPUT mode explicitly disables the internal pullups.

Syntax

pinMode(pin, mode)

Parameter Values

  • pin: the Arduino pin number to set the mode of.
  • mode: INPUT, OUTPUT, or INPUT_PULLUP. See the Digital Pins page for a more complete description of the functionality.

Return Values

  • Nothing

Example Code

The code makes the digital pin 13 OUTPUT and Toggles it HIGH and LOW

void setup() { pinMode(13, OUTPUT); // sets the digital pin 13 as output } void loop() { digitalWrite(13, HIGH); // sets the digital pin 13 on delay(1000); // waits for a second digitalWrite(13, LOW); // sets the digital pin 13 off delay(1000); // waits for a second }

※ NOTES AND WARNINGS:

The analog input pins can be used as digital pins, referred to as A0, A1, etc.

void setup() { pinMode(A5, OUTPUT); // sets the digital pin A5 as output } void loop() { digitalWrite(A5, HIGH); // sets the digital pin A5 on delay(1000); // waits for a second digitalWrite(A5, LOW); // sets the digital pin A5 off delay(1000); // waits for a second }

See Also

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